Yarn-severing device for knitting-machines



R. FISHER.

YARN SEVERING DEVICE FOR KNITTING MACHINES.

APPLICATION FILED JUNE 10. I915- RENEWED DEC. 15,1917.

Patented Oct. 19,1920.

3 SHEETS-SHEET I- m N ssis Fl 514 & I WQZQ M 6 RAVI-10:40

R. FISHER.

YARN SEVERING DEVICE FOR KNITTING MACHINES.

. APPLICATION FILED JUNE 10, 1915. RENEWED DEC. I5, I9I7.

I 0 W 2 m 11H d 4 tm nuE m M3 m .0 m 6 B 0 Yr J m 7 Z 2 .a "I: AIIWINVQNTQRI R V' I R. FISHER. YARN SEVERING DEVICE FOR KNITTING MACHINES.

APPLICATION FILED JUNE 10. 1915. RENEWED DEC-15,1917.

Pat/$111366. 0011. 19, 1920.

3 SHEETS-SHEET 3.

UNITED STATES PATENT OFFICE.

RAYMOND FISHER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, BY MESNEASSIGNMENTS, TO HEMIBHILL MANUFACTURING COMPANY;

OF PAW- TUCKET, RHODE ISLAND, A CORPORATION OF RHODE ISLAND.

YARN-SEVERING DEVICE FOR KNITTING-MACHINES.

Application filed June 10, 1915, Serial No. saw.

To altwhom it may concern:

Be it known that I, RAYMOND FISHER, a'

citizen of the United States, residing in Philadelphia, Pennsylvania,have lnvented certain Improvements in-Yarn-Severin Deyarn or yarns in apart only of the knitted web, as for instance in" the sole portion ofthe footof astocking,the reinforcing yarn being severed asfsoo'n as eachpartial course has been completed and the cut end of the yarn beingagain applied to the needles at the beginning of the next partialcourse.

My invention consistsof certain mechanism for severing the reinforcingyarn and retaining the severed end'of the same while the reinforcingyarn feeder is out of action, and releasing it when said feeder againmoved to feeding position..."

In the accompanying drawings Figure 1 is a side elevation of a machineof the Hemphill type to which myinvention hasbeen applied; i

Fig. 2 is a top view of the same onan enlarged scale, and reversed,right for left;

Fig. 3 is a top view-of certain of the parts shown in Fig. 2 but in 'adifferent position from that there represented v Fig. 4 is a orizontalsectional view of parts of the a tachment shown by dotted lines in Fig.2;

Fig. 5 is a view similar to 1,.but illustrating certain modifications'of my invention; 4

Fig. 6 is a view, partly in side elevation and partly in section, ofcertain of such modified mechanism on a larger scalethan- Fig. 5; 1

Fig. 7 is a transverse section on the line (Z(1, Fig. 6; and v Fig. 8 isa side elevation of certainof the parts shown in Fig. 3, looking in thedirection of the arrow in said figure.

In the drawing, 1 represents part of the rotating needle cylinder of amachine of the Hemphill type, 2 one of the reciprocating web holders atthe top of said cylinder, 3 the web holder supporting and guiding ringmounted upon and rotating withthe needle cylinder, 4 thenon-rotating'cam cap for ef- Specification of Letters Patent.

t'ion 0 has. been Patented Oct. 19, 1920. Renewed December 15, 1917.Serial No. 207,881,

fecting reciprocation. of the web holders,

and 5 the latch guard ring above the needle cylinder,-all of these partsbeing similar in construction and function to the correspondmg parts ofthe Hem hill machine and hence forming no part 0 my invention.

Fixedly mounted above'the top of the needle cylinder is a semi-circularplate 6 having t erein a tangential gap 7 extending to the periphery ofthe plate, the outer porsaid gap being bridged by a shear blade 8 whichis fixedly mounted on the plate, as shown in Fig. 2. Beneath the plateis a movable shear blade 9 which is carried by a stem 10, the latterpassing through a lug 11 on the underside of the plate and having aprojecting pin ,12 WhlCh enga es a forked arm 13 free to lay in a,slotteportion of the lug 11 and xedly mounted upon shown in Fig. 4.

The shaft 14 is free to turn in bearings in the plate 6 and in an arm 15which is mounted on the latch guard ring 5 and projects inwardly abovethe top of the needle cylinder.

The shaft 14 has at its upper end an arm 16 adapted to be acted upon bythe beveled lower end 17 of a stud 18 carried by and pro--.

j ecting downwardly from one arm of a lever ted for the reception of apin 20 at the upper end of a bar 21 normally pulleddownward by means ofa spring 22 (Fig. 1) and connected at its lower end to a lever 23pivotally mounted upon any suitable fixed portion of the machineand-having at its free end an anti-friction roller 24 adapted to be Fig.3, and on said spring isa depending lug 27 (Fig. 8) which bears upon theouter face of the shear blade 9.

A coiled spring 14 (Fi 6) surrounds the shaft 14, the lower en of thisspring engaging the plate 6.and its upper end engaging a collar 14 onthe shaft 14, the tendency of this spring being to move the shaft 14 inthe direction of the arrow Fig. 2, so as 19 (Figs. 1, 5 and 6) whoseother arm is slotv to open the shear blade 9, and thus push the i Theregular yarn spring plate 27 away from the face of the fixedshear blade8, as shown in Fig. 2, but when the shear blade 9 is drawn toward theshear. blade 8 so as to sever the yarn passing between them the spring27 will contact with the outer face ofthe shear blade 8, as shown inFig. 3.

When the arts are in the "position shown in Figs. 1 an 2 the arm 16 isfree from con-. tact with the beveled lower end of the stud 18, but whenthe lever 19 is actuated so;as to depres the stud 18 the beveled" lowerend of the latter contacts with the arm 16 and moves the shaft 14 andits arm 13 in a direction the reverse of that indicated by the arrow inFig. 2.

The cam on 'the bevel wheel 25 which effects the movement of the lever19 at the proper times as capable of expansion and contraction, said cambeing, as shown in Fig. 1, composed of a segmental plate 28 securedto5orforming part of the bevel wheel 25' and carrying two segmental arms29 which have cam-forming ends 30, the arms 29 being mounted upon theplate 28 so as to be susceptible of circumferential adjustment thereon,screws 31 carried by the arms 29 being adapted to segmental slots 32 insaid plate 28, so that bg looseningthe screws 31 the arms 29 may eadjusted on the plate 28 to expand or contract the cam, after which saidarms 29 can be secured to the late by again tightening said screws.

T e lever 23 has a projecting pin 33 thereon which enters a slot 34 inthe upper end of a link 35 the latter being connected at its lower endto one arm of a lever 36 pivotally mounted on some (part of the fixedframe of the machine, sai arm being acted upon by a spring 37 whichtends to draw a toe 38 on the other arm of the lever 36 down onto theperiphery of a pattern drum 39 which is provided with one or more cams40, as shown in Fig. 1. When the lever 36 is being acted upon by a. cam40, as shown in Fig. 1, the lever 23 is free to rise and fall under theaction of the cam on the bevel wheel 25 so as to alternately open andclose the shear blade 9. When, however, the lever 36 24 from the actionof the cam on the bevel wheel 25 and the shear blade 9 and spring clamp27 will be moved to the dposition shown in Fig. 3 and will be retaine inthat position until the lever 36 is again acted upon by a cam 40.

ides of the machine are shown at w-as in ig. 2, and the supplementary orreinforcing yarn guide at in aid figure. When the yarn feeding en s ofthese guides are down, as shown at m the yarn will be fed to theneedles, but when said end of the yarn guide is elevated, as

, fixed and mova between said shearlblade 8 and the spring are vention,and in Figs. 5. and 6 shown at 3 it will be carried above the topstherefrom to the. last needle which drew a stitch ,of said yarn will,pass between the le shear blades 8 and 9 and clamp'27, as shown in. Fig.2, and will afterward be-severed bythe inward movement of themovableshear blade 9, one of the severed ends being carried around by theneedles and the other being caught and held between the face of theshear blade 8 and the clamping s ring 27 as shown in Fig. 3.

, While I pre er, in al cases, to mount the cam which actuates themovable shear blade 9- upon the driving wheel 25 of the machine otherlocations thereof and othermeans for causing the same to act upon thelever 19 permissible within the sco e of m inhave illustrated one suchmodification of my invention.

In this case the cam carrying arms 29 are adjustably mounted upon theneedle cylinder l by means of screws 31 and slots 32, the adjoining endsof said arms 29 being referably interlocked, as shown in Fig. 5.

asshown in Fig. 2, the yarn y" in passing on the frame of the machineand engaging one arm of a lever 43 pivotally mounted on said plate, the.other arm of said lever engaging a bar 21' which is slidably mountedupon the plate and is operatively connected at its 11 per end to thelever 19, a sprin 22 tending to normally depress the bar. he latter Wllltherefore be raised and lowered on each rotation of the needle cylinderso as to open and close the shearing blades at the proper times. When itis desired to put the shearing mechanism out of action temporarily thelever 43 is acted upon by another lever 44 pivotally mounted on theplate 42 and connected by means of an adjustable rod 45 to the lever 36,as shown in Fig. 5, the cams 40 in this case operating in a manner thereverse of that shown in Fig. 1.

I claim:

1. The combination, in a reinforcing yarn severing and clamping devicefor knitting machines, of a fixed shear blade, a shear blade movablefrom and toward said fixed shear blade, means for so moving the movableshear blade, and a resilient clamping plate normally acting to press theyarn a ainst the fixed shear blade, said clamping p ate also having abearing upon the movable shear blade whereby when the shears are openedthe yarnengaging portion of the clamping plate will be moved away fromthe fixed shear blade and when the shears are closed said yarn engagingportion of the clamping plate will be permitted to move toward saidfixed shear blade.

2. In a reinforcing yarn severing device for knitting machines, thecombination of a pair of shear blades occupying a fixed circumferentialrelation to the needles, and

in unison with the needle cylinder of the machine, a lever operated bysaid cam, a cam independent of the first, and a lever actuated by saidsecond cam and in operative connection with the first-named lever,'saidoperative connection having a lost motion connection with one of thelevers.

4. In a knitting machine, the combination with the needle cylinder, of aplate fixedly mountedabove the top of said needle cylinder, a pair ofshear blades tangentially mounted in said plate, and means for movingone of said shear blades with respect to the other.

5. In a knitting machine, the combination with the needle cylinder of aplate fixedly mounted above the top of said needle cylinder, atangential gap therein extending to the periphery of the plate, theouter portion of said gap being bridged by a fixed shear blade, amovable shear blade mounted upon said plate and means for reciprocatingsaid movable'shear blade.

6. Ina knitting machine, the combination with the needle cylinder, of asemi-circular plate fixedly mounted above the top of said needlecylinder and at right angles there with, a tangential gap in said plateextending to the periphery thereof, a fixed shear blade bridging theouter end of said gap, a movable shear blade upon said plate, a

spring secured at one end to the periphery of said plate and having alug arranged to bear upon the outer face of said movable shear blade,and means for reciprocating said movable shear blade.

7. In a knitting machine, the combination with the needle cylinder, of ayarn severin and clamping device embodying a fixed shear blade, amovable shear blade, means for reciprocating said movable shear blade,and a spring member having a portion thereof in continuous engagementwith said movable 'shear blade and its free end arranged and adapted toengage and disengage said fixed shear blade.

8. In a knitting machine, the combination with the needle cylinder, of aplate fixedlymounted above the top of said needle cylinder a fixed shearblade and a movable shear blade mounted upon said plate, means forreciprocating said movable shear blade and aspring member provided witha lug arranged to bear against the outer face of said .movable shearblade, the free end of said spring member being arranged and ada ted 0engage and disengage said fixed s ear lade.

9. In a reinforcing yarn severing device for knitting machines, thecombination of a fixed shear blade, a sliding shear blade movable fromand toward said fixed blade, a shaft having two arms, a stud on the stemof the movable shear blade engaging one of said arms, a lever actingupon the other arm to move the same, and means for vlbrating said leverat intervals.

In testimony whereof, I have slgned my witnesses. RAYMOND FISHER.-Witnesses:

ELsm Hnnnrmn, KATHRYN Asnwonm.

two subscribing name to this specification, in the presence of

